Pot-type burner with hollow pilot



April 18, 1944. s PERRY 2,346,781

POT TYPE BURNER WITH HOLLOW PILOT Filed Aug. 8, 1941 2 Sheets-Sheet 1April 18, 1944. s. PERRY POT TYPE BURNER WITH HOLLOW PILOT,

2 Sheets-Sheet 2 Filed Aug. 8, 1941 H 4 6. 0 9 5 w 3 3 M m o o 710. m 4m MW. m 0 Q 4 o .2 o 4 w 7 a A m o m o .0 U o O 8 O, m o 4 2w 9 m o o /MGA 0 f M w 0 0 0 FT Q V P 0M @[nvaznfor ,Szarzlg $297737.

Patented Apr. 18, 1944 POT-TYPE BURNER WITH HOLLOW PILOT Stanley Perry,Chicago, 11]., assignor to (ill Dc- Santa of Illinois Fe, N. Mex alimited partnership Application August 8, 1941, Serial N0. 405,932

1 Claim. My invention relates to an improvement in pot type burners andhas for one P rpose the provision oi improved pilot means for such aburner.

Another purpose is the provision of improved pilot means in which thepilot structure is to some extent cooled and protected by the supply ofair passing therethrough.

Another purpose is the provision'of a hollow pilot structure for pottype burners.

Another purpose is the provision of a pilot structure which serves asair supply means for the pilot stage.

Another purpose is the provision oi a pilot which supplies primary andsecondary air for pilot combustion. I

Other purposes will appear from time to time in the course of thespecification and claim.

I illustrate my invention more or less diagrammatically in theaccompanying drawings wherein:

Fig. 1 is a sectional view of a heater with my invention installed:

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a sectional view oi the burner. showing a modified form oi thepilot ring; and

Fig. 4 is a section on the line H of Fig. 3.

Like parts are indicated by like symbols throughout the specificationand drawings.

Referring to the drawings, I generally refers to an outer housing,herein shown in the form of a drum. It may include an upper portion 3adapted 'to serve as a combustion chamber for high flre, and under somecircumstances as a direct radiating member, as when the device is usedfor a radiant space heater. Any suitable flue means may be provided inconnection with the portion 2. not herein shown. 3 is a partitionextending across a lower portion of the drum i and provided with acentral air inlet aperture 4. 6 are any suitable means for supportingthe burner structure.

It will be understood that air may penetrate through any suitablesupporting means 5, which may constitute or include legs or the like, sothat air may flow upwardly through the central aperture 4 of thepartition 3. 6 is any suitable pot supporting means, herein shown as anangle ring. 1 indicates a pot-having a plurality oi primary air inlets3.

I may provide any suitable secondary air vsupply means adjacent the topof the pot, but I inlets 8 adjacent the top of the pot. The pct isprovided with any suitable flange Iii adapted to rest upon the ring 6.ii is any suitable flame ring for the top 01' the pot, having a centraloutlet aperture l2.

i3 is any suitable fuel supply line extending to the bottom of the potfrom a source oi liquid fuel not herein shown. The level of fuel may becontrolled in any suitable manner, for example by any suitable floatchamber or the like not herein shown. I may employ any suitable valve orcontrol means not herein shown for varying the rate of supply or thevolume of flow of the liquid fuel along the line i3.

Referring to the form of Fig. 1, ll illustrates a central pilot airinlet and support. It may be in the form of a pipeterminating at i5.Mounted upon said pipe and supported thereon is a pilot structure whichmay include an upper conic wall i6, herein shown as having a generallycylindrical outer skirt portion i1. i8 is a lower wall generallyparallel with the upper wall It, the structure as a whole being shown asupwardly and inwardly conic. I9 is an inner wall connecting theinneredges of the-wall l8 and i3 and provided with a plurality ofapertures 20, which may constitute secondary air inlet apertures for thepilot stage. 2| is any suitable combustion ring herein shown as centeredby a flange 22. The ring is shown as somewhat downwardly and inwardlyinclined. The ring is in effect a flame ring or combustion ring for thepilot stage. It isprovided'with a central aperture 23 of substantialsize. The lower outer edge portion of the wall i3 is provided with aplurality of air inlets 24, which serve as primary air inlets for thepilot stage of combustion.

The pilot structure as a whole may be supported upon the upstandingpilot air inlet i4, and may be centered thereon, for example by thecentral sleeve 30, which is provided with an inwardly extending flange3|, adapted to rest upon the upper edge of the pilot air inlet l4. Airfrom the pilot inlet it may be conducted to the air space definedbetween the walls I 6 and "by any suitable ducts herein shown at 32 and33. Any suitable number 01' these-ducts may be employed. I illustratefor example three.

Referring to the form orFigs. 3 and4, I illustrate a variant form ofstructure in which I employ a plurality of separate pilot inlet passages43, extending upwardly from the bottom of the pot. I may for exampleemploy three. In the variant structure the pilot element includes a topconic wall ii, a bottom conic wall 42, an outer somewhat more conic thanthe inner portion.

The angle may be set at any suitable fashion in order to direct the airfrom the pilot primary apertures inwardly as well as downwardly.

In the form of Figs. 3 and 4 I illustrate a combustion ring 41, whichmay be formed integrally with the pilot structure or may be mountedremovably. It is also provided with a central aperture 48.

It will be realized that, whereas I have described and illustrated apractical and operative device, nevertheless many changes may be made inthe size, shape, number and disposition of parts without departing fromthe spirit of my invention. I therefore wish my description and drawingsto be taken as in a broad sense illustrative or diagrammatic, ratherthan as limiting me to my recise showing, except as limited by theclaim. The use and operation of my invention are as follows:

In pot type hydroxylating burners a maximum turndown to the pilot stageis desirable so that the pilot flame is of insuflleient sizesubstantially to heat the burner. n the other hand, the pilot structurecahnot practically be removed when the burner is burning at high stage.I, therefore, provide a. pilot structure which is effective at the pilotstage and which itself serves as the source of all the air necessary forpilot combustion, in-

eluding both primary and secondary air. When the burner is at .highstage the primary air or part of the primary air for combustion is sup-.

plied by the primary air inlets 8 of the wall of the burner pot, all ofwhich are located above the above described bame structure. And thesecondary air for high stage combustion may be supplied by the secondaryair inlets 9 of the pot. When the burner is burning at high stage, aircontinues to flow through the pilot structures and serves a coolingeflect, preventing burning out of the pilot structure by the intensityof the flame of pilot combustion. I also find it desirable, although notnecessary, to provide an air gapbetween the outer edge of ,the pilotstructure and the opposite wall of the burner. This gap is illustratedfor example at A in Figs. 1 and 2, and at B in Figs. 3 and 4.

I claim:

In combination in a pot type burner, a burner pot having acircumferential side wall with a plurality of air inlet apertureslocated at various levels therein, a liquid fuel duct extending to saidpot, said pot having a closed bottom and an open top, an air inletpassage upwardly extending from the center of the bottom of the pot andan air distributor located at the upper end of said passage andincluding a hollow ring, the outer edge of which approaches but isspaced from the side wall of the pot at a level below the lowest of theair inlet apertures in the wall, said ring having a lower wall providedwith a plurality of air outlet apertures adapted to direct airdownwardly and inwardly toward the bottom of the pot, and air conduitsand supports extending generally radially outwardly from said centralair inlet passage to said ring, the ring having a central aperture, anda centrally apertured pilot ring partly closing the aperture of thehollow ring STANLEY PERRY.

